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石油实验地质  2017, Vol. 39 Issue (4): 484-490    DOI: 10.11781/sysydz201704484
盆地·油藏 本期目录 | 过刊浏览 |
鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制
王付斌1, 尹伟2, 陈纯芳2
1. 中国石化 华北油气分公司 勘探管理部, 郑州 450006;
2. 中国石化 石油勘探开发研究院, 北京 100083
Forming mechanisms of reservoir “sweet spots” in tight sandstones of Chang8 Formation, Honghe oil field, Ordos Basin
Wang Fubin1, Yin Wei2, Chen Chunfang2
1. Exploration Management Department of SINOPEC North China Branch Company, Zhengzhou, Henan 450006, China;
2. SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China
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摘要: 鄂尔多斯盆地红河油田长8油层组储层物性普遍具有低渗—致密特征,但局部发育储层“甜点”(即相对优质储层),并控制着油气富集高产,因此,开展储层“甜点”成因机制研究对致密砂岩储层预测意义重大。通过大量岩石薄片、铸体薄片、阴极发光、扫描电镜、荧光薄片等的系统观察与统计,结合储层矿物组成、胶结物含量、物性测试分析,从沉积建造到成岩改造开展了储层物性影响因素的全过程分析,剖析沉积、成岩、破裂及油气侵位作用对致密砂岩储层储集性能的影响。结果表明,沉积作用是控制致密砂岩储层物性的第一位因素,奠定了致密砂岩储层发育的物质基础,并控制了其原始物性;成岩作用控制了致密砂岩储层的孔隙演化,其中建设性成岩作用控制了储层“甜点”的发育,并最终控制了孔隙型致密砂岩储层“甜点”分布;裂缝大大提高了致密砂岩储层渗流能力,并最终控制了裂缝—孔隙型致密砂岩储层“甜点”分布;油气侵位抑制了胶结作用的进行,是致密砂岩储层“甜点”重要的保持机制。
关键词 储层“甜点”沉积作用成岩作用油气侵位长8油层组红河油田鄂尔多斯盆地    
Abstract:Reservoir "sweet spots" (that is, relatively high quality reservoirs) exist locally in the low-permeability, tight sandstone reservoirs of Chang8 Formation in the Honghe oil field, controlling hydrocarbon enrichment and production. This reservoir provides evidence and direction for prediction of tight sandstones to study their forming mechanisms. The impacts of sedimentation, diagenesis, fracturing and oil emplacement on reservoir quality of the tight sandstones during the whole reservoir evolution process from sedimentary construction to diagenetic reformation were systematically analyzed using rock sections, casting thin sections, cathode-luminescence, scanning electron microscopy, micro fluorescence observations and statistics, combined with the analyses of mineral composition, volume of cementation minerals and reservoir physical tests. The results indicate that sedimentation is the most important factor controlling tight sandstone reservoir properties by providing a material basis and controlling the original properties of tight sandstones. Diagenesis is another factor which controls the porosity evolution of tight sandstones, and construction diagenesis controls the formation of reservoir "sweet spots" in tight sandstones and the distribution of "sweet spots" in pore-type tight sandstone reservoirs. The superimposed reformation of structural fractures improves the reservoir properties of tight sandstones, especially the permeability, resulting in the distribution of "sweet spots" in fractured tight sandstone reservoirs. Oil emplacement inhibits cementation as one of the important mechanisms of "sweet spot" preservation in the tight sandstone reservoirs.
Key wordsreservoir “sweet spot”    sedimentation    diagenesis    oil emplacement    Chang8 Formation    Honghe oil field    Ordos Basin
收稿日期: 2017-05-01     
ZTFLH:  TE122.24  
基金资助:国家科技重大专项“中西部重点碎屑岩层系油气富集规律与勘探方向”(2016ZX05002-006)资助。
作者简介: 王付斌(1973—),男,硕士,高级工程师,从事油气勘探研究工作。E-mail:wderdos@163.com。
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王付斌, 尹伟, 陈纯芳. 鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制[J]. 石油实验地质, 2017, 39(4): 484-490.
Wang Fubin, Yin Wei, Chen Chunfang. Forming mechanisms of reservoir “sweet spots” in tight sandstones of Chang8 Formation, Honghe oil field, Ordos Basin. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(4): 484-490.

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http://www.sysydz.net/CN/10.11781/sysydz201704484      或      http://www.sysydz.net/CN/Y2017/V39/I4/484

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